The shelling as reported by the Chinese CCTV
More discussion is ongoing in China-Defense Forum.
One thing to note:
The South Korean was able to ToT-ed most of the North's positions with their K-9 155mm howitzers. The North did not cease fire, it was put out of action.
“Because the K9 is very accurate, the North Korean military bases were probably reduced to rubble,” said the official.